What makes a marriage unsuccessful? Good question. What is a marriage? Is it an agreement between two people? Is it a social norm? Is it biological necessity? Is it built on expectations of one from the other?
There is no algorithm to find a partner and get married; buy a house, raise children and live happily ever after.
Every cell in our body loves each of the trillions of cells in our body. If one cell is hurt, all other cells rush to help and if a toe is hurt at the foot, the eyes are watery. Love is not to be understood. It is to be experienced. Every cell in you loves every cell in another human body also. If you hate someone, while your cells by design love the other, there is a short circuit in the electromagnetic field in your body and your body is at dis-ease. Stress is created and becomes disease of even higher intensity. Medical journals have many experiments to prove this.
Love is in you already. You were created with the DNA of God in you and God is love. Every cell in our bodies are wired to love and to attract love in another human cells. The love in our cells is to be manifested. Once you choose your partner, accept the partner as he/she is. Your happiness is in you, and not on any one else. If your partner likes action movies and you like historical movies, accept it. Flexibility is needed only from one partner. Need not be from both. Two hands are needed to clap and make noise.
Be happy. Happiness doesn’t come from another person, married or not. Essentially it is from you only. Inside you, is the key. Love is the source of life. Bring it out. Give it. Give it. The more you love other beings, the more you will see love radiating from you in all directions.